Rotary swash plate hydraulic pump
US-12584467-B2 · Mar 24, 2026 · US
of machines or pumps with stationary cylinders
of machines or pumps with stationary cylinders · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F04B1/28 |
| Official title | of machines or pumps with stationary cylinders |
| Display label | of machines or pumps with stationary cylinders |
| Total patents | 26 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 2 |
| 2017 | 1 |
| 2018 | 5 |
| 2019 | 3 |
| 2020 | 3 |
| 2021 | 1 |
| 2022 | 1 |
| 2023 | 1 |
| 2024 | 1 |
| 2025 | 4 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Rotary swash plate hydraulic pump
US-2026015997-A1 · Jan 15, 2026 · US
Rotary swash plate hydraulic pump
US-2026002525-A1 · Jan 1, 2026 · US
Rotary swash plate hydraulic pump
US-2025207570-A1 · Jun 26, 2025 · US
Rotary swash plate hydraulic pump
US-2025207569-A1 · Jun 26, 2025 · US
Electrohydraulic pitch setting with reversible pump
US-12330769-B2 · Jun 17, 2025 · US
Rotary swash plate hydraulic pump
US-2025188913-A1 · Jun 12, 2025 · US
Electrohydraulic pitch setting with reversible pump
US-2024253770-A1 · Aug 1, 2024 · US
Method for Operating a High-Density Solids Pump and High-Density Solids Pump
US-2023026231-A1 · Jan 26, 2023 · US
Cylinder drive device and flow channel unit
US-2022018341-A1 · Jan 20, 2022 · US
Axial piston machine with recess in the region of the loading pressure channel
US-10954936-B2 · Mar 23, 2021 · US
Axial piston machine
US-10859061-B2 · Dec 8, 2020 · US
Variable displacement pump-motor
US-10738757-B2 · Aug 11, 2020 · US
Hydrostatic axial piston motor of bent-axis construction
US-10590908-B2 · Mar 17, 2020 · US
Axial Piston Machine with Recess in the Region of the Loading Pressure Channel
US-2019360482-A1 · Nov 28, 2019 · US
Axial piston machine with outlet control
US-10451027-B2 · Oct 22, 2019 · US
Apparatus, system, and method for introducing a liquid into a vessel
US-10215169-B2 · Feb 26, 2019 · US
Axial piston machine
US-2018258907-A1 · Sep 13, 2018 · US
Hydrostatic Axial Piston Motor of Bent-Axis Construction
US-2018195491-A1 · Jul 12, 2018 · US
End of stroke detection for plunger velocity correction
US-9989048-B2 · Jun 5, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04B1/28?
- CPC F04B1/28 is the Cooperative Patent Classification code for “of machines or pumps with stationary cylinders.”
- How many patents are filed under CPC F04B1/28 (of machines or pumps with stationary cylinders)?
- Our database includes 26 publications tagged with this CPC code.
- Is patent activity under CPC F04B1/28 growing?
- Publication counts under this code: 1 in 2024 vs 4 in 2025 (latest complete years).